Added PR template (#34)

.github/pull-request-template.md

@@ -0,0 +1,11 @@
+### Description
+
+Please explain the changes this PR addresses here.
+
+### Checklist
+
+- [ ] If this requires a documentation change, I have created a PR in [moonbeam-docs](https://github.com/PureStake/moonbeam-docs) repository.
+- [ ] If this requires it, I have updated the Readme
+- [ ] If necessary, I have updated the examples
+- [ ] I have verified if I need to create/update unit tests
+- [ ] I have verified if I need to create/update acceptance tests